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Focal's FPS High Cap outboard capacitor module reinforces the power of your FPS amp exactly when  and where  it's needed most. This cap maintains high current flow to your amplifier, and smoothes out any power fluctuations caused by sudden musical demands, so you enjoy consistent, superb sound quality.

While most car audio caps wire up to the amp's power connections, Focal's High Cap module plugs directly into your FPS amplifier to reinforce power where it counts  as close as possible to the amp's output stage. Power transfers from cap to amp instantaneously, resulting in improved dynamic and transient response, especially in the low frequencies.

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are the hi-caps worth it?

Emphatically yes...I have used external capacitors with car amps in the past but the Focal arrangement is better engineered and really does work....ten minutes to install and better bass, smoother highs and an altogether sweeter response from the amp, Focal Polyglass speakers and the JL Stealth subwoofer. Well worth the money !

Pros:better sound overall not just in the bass where I expected it, a good value upgrade

Cons:none really apart from the additional cost and finding a suitable space to install

Hands-on research

What's in the box?

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Features

Overview: The Focal High-Cap is an external power supply module. Once
connected to a compatible Focal amplifier, it increases the amplifier's power
supply. The resulting benefit is a higher-fidelity audio signal from your
connected Focal amplifier and overall better music performance, with enhanced
dynamic behavior, improved speaker control and punchier bass.

Compatibility: The Focal High-Cap is compatible with the following
Focal FPS series amplifiers.

Connection Cable: The Focal High-Cap has an attached 11" cable
terminated by a proprietary 4-pin connector which plugs into the proprietary
High-Cap port of the compatible Focal amplifier.

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